Unfair treatment

I was a victim of crime on the 3rd of May and my phone was taken from me. My phone was unlocked so the people who took it gain access to make st of the things that are in my phone. They logged into my Afrihost app and requested R500 and 20gigs of data on my Airmobile sim card that was lost last year and I did report to Afrihost that I lost the sim card. Now I am expected to pay close to R800 that I did not use. The airtime and data are not used, they are still in the sim card but Afrihost us refusing to reverse it. Which I find unfair. I've been their client for the past two years butthus is the kind of treatment that I get from them